Opex-Å is a compact steam boiler supplied in low pressure versions, six sizes 150–1000 kW, and high pressure versions, nine sizes 150–2000 kW. The boiler consists of a horizontal pressure vessel insulated with mineral wool. The system is protec-ted by a painted AluZinc sheet steel cover.

Opex-Å is fired using oil or gas. Combustion takes place in the centre of the combustion chamber. The fully water cooled rear wall returns fumes along the combustion chamber exterior walls, after which the fumes enter the flue gas tubes. The combustion chamber and flue gas tubes are accessible via the opening of the short side with the burner. The design provides a compact and high efficiency boiler for oil and gas firing. A safe full combustion of the fuel is guaranteed, which is an important factor with respect to environmental considerations.

Boilers are supplied with factory fitted control system, burner and fittings.